Jim's abilities are tested time and time again. The young man with a natural way with horses finds himself having to struggle against horrific storms, treachery and death in his goal to somehow fulfil his uncle's dream of breeding the fastest horse in the land. His life is enriched when he falls in love with the charming young daughter of his new foreman.
Up on the mountain above Jim's ranch stands a beautiful wild stallion. He stares down remembering the torment and brutality he suffered at the hands of humans.
His name is Ghost and he has developed a taste for raiding horse ranches. He steals the mares to enlarge his herd. Ghost is the cause of tragedy at the Brannigan ranch after stealing their prized black filly, Ebony Wind.
The union between them produces Blue Taboo, who was born during a terrifyingly violent storm. The trauma of his birth mysteriously leaves the huge colt with strange electrifying powers.
The lives of the young man on the ranch and the wild blue stallion of the mountain gradually become entwined with amazing results.